Patent protection for the early versions has already ended. Teva is making generic versions of liraglutide and it's been available in the US for a few months. The other GLP-1 agonists will be protected for a few more years though.
True but imagine the price and availability impact when the oral formulations go off-patent. The autoinjectors are inherently expensive to make and ship, and some people have a needle phobia. Oral daily seems like the endgame here.